Structure of dual-lens with mechanic zero tilt angle and adjustment method thereof

ABSTRACT

A dual-lens mechanic zero tilt angle adjustment method is disclosed, comprising a preparation step, an adjustment step and an engagement step, wherein preparation step comprising: disposing a dual-lens at one or two voice coil motors (VCM), with the dual-lens having optical axes respectively unparallel to the normal of the plane of an adaptor, and the optical axes forming a first and second tilt angles with the normal of the adaptor plane; adjustment step comprising: adjusting the first and second tilt angles by moving VCM to zero degree; and engagement step comprising: adhering the bottom of VCM to an engagement surface of adaptor to obtain a structure of dual-lens mechanic zero tilt angle. As such, the adaptor plane is engaged to the image sensor, and the tilt angles between the optical axes of dual-lens and the axis of the image sensor are both zero to improve imaging quality.

CROSS-REFERENCE TO RELATED APPLICATION

The present application is based on, and claims priority form, TaiwanPatent Application No. 105129608, filed Sep. 12, 2016, the disclosure ofwhich is hereby incorporated by reference herein in its entirety.

TECHNICAL FIELD

The technical field generally relates to a structure of dual-lens andadjustment method thereof, and in particular, to a dual-lens structurewith optical axes forming zero tilt angle with the axis of the magesensor simultaneously, and adjustment method thereof

BACKGROUND

As the mobile phone with camera become ubiquitous, the consumers demandever-increasing higher image quality. The improvement in the quality ofimaging comes from the design and manufacturing technology, wherein therelative angle offset (i.e., tilt angle) between the optical axes of adual-lens structure becomes a key factor in the quality of imaging.

Refer to FIG. 1 and FIG. 2. FIG. 1 shows a schematic view of a voicecoil motor of a known dual-lens structure, and FIG. 2 shows a dissectedview of a voice coil motor of a known dual-lens structure. Theconventional dual-lens structure comprises two voice coil motors 1 (withthe figures showing only one of the two voice coil motors), two lenses(not shown), and a image sensor (not shown). Each voice coil motorcomprises an outer cover 1A, an upper resilient stripe 1B, a magnet 1C,a coil 1D, a base 1E, a lower resilient stripe 1F and a lower cover 1G.The two lenses are disposed respectively to the base 1E of each voicecoil motor 1. The image sensor and the lower covers 1G of the two voicecoil motors 1 are engaged together.

However, because each component of the voice coil motor has a tolerance,and the assembled voice coil motor generates a tolerance stack up, thetolerances and the tolerance stack up cause the optical axes of the twolenses non-perpendicular to the bottom surface of the lower cover 1G ofthe two voice coil motors 1. Hence, after the image sensor is engaged tothe bottom surface of the lower cover 1G of the two voice coil motors 1,the optical axes of the two lenses form a tilt angle and are unable tobecome parallel to the axis of the image sensor, which reduces theimaging quality of the image sensor. Even worse, the tilt angles formedbetween the two optical axes and the axis of the image sensor differfrom each other, resulting further degradation the imaging quality.

The conventional solution is to improve the precision of the componentsand reduce the tolerance of each component and the tolerance stack upafter assembly, so as to reduce the tilt angle to improve imagingquality.

Although the new precision machinery technologies can improve thecomponent precision, it is still difficult to achieve a completeprecision for each component in mass production process. The reason liesin the machine vibration, material variation, abrasion of tools,temperature variation, residual stress in components, and so on.Therefore, however the precision improves, a zero-tolerance for eachcomponent is simply unachievable, not to mention the tolerance stack upafter assembly. In other words, the probability of achieving zero tiltangles between the two optical axes and the axis of the image sensor isvery low and the conventional solution shows limitations. Moreover, theprecision improvement often takes longer time to achieve, as well asincurring higher production costs.

SUMMARY

The primary object of the present invention is to provide a adjustmentmethod for a dual-lens structure with mechanic zero tilt angle, foradjusting the first tilt angle and the second tilt angle between theoptical axes of the dual-lens and the normal of the adaptor plane to 0°so that the optical axes of dual-lens are parallel to the axis of theimage sensor to achieve zero tilt angles simultaneously between theoptical axes of the dual-lens and the axis of the image sensor toimprove imaging quality. The adjustment method provides ease to use,high efficiency and low production cost.

Another object of the present invention is to provide a dual-lensstructure with mechanic zero tilt angle, with the optical axes of thedual-lens perpendicular to the normal of the adaptor plane so that theoptical axes of dual-lens are parallel to the axis of the image sensorto achieve zero tilt angles simultaneously between the optical axes ofthe dual-lens and the axis of the image sensor to improve imagingquality. The structure provides ease in structure, high efficiency andlow production cost.

To achieve the aforementioned object, the present invention provides anadjustment method for dual-lens structure with mechanic zero tilt angle,comprising the steps of: a preparation step: disposing two lenses of thedual-lens structure respectively at two voice coil motors (VCM), withbottom surfaces of the two VCMs maintaining a distance to an engagementsurface of an adaptor, the two optical axes of the two lenses unparallelto each other and the normal of a reference plane of the adaptor so thatthe optical axes forming a first and second tilt angles with the normalof the reference plane of the adaptor; an adjustment step: moving atleast one of the two VCMs and the adaptor to adjust the first and secondtilt angles to 0°, the optical axes of the two lenses beingperpendicular to the reference plane of the adaptor and the at least oneof the two VCMs and the adaptor stopping moving; and an engagement step:adhering the bottoms of the VCMs to the engagement surface of theadaptor.

Preferably, the adjustment step comprises: a first adjustment: movingone of the VCMs to make the optical axes of the two lenses parallel; anda second adjustment: moving the two VCMs simultaneously to adjust thefirst and the second tilt angles to 0°.

Preferably, a sensor is used for sensing the first and the second tiltangles; when the sensor sensing that the first and the second tiltangles becoming 0°, the at least one of the two VCMs and the adaptorstops moving.

Preferably, the adaptor is disposed on a surface of a work table, withtwo mechanical arms moving the two VCMs and the sensor disposed at thework table; and when the sensor sensing that the first and the secondtilt angles becoming 0°, the two mechanical arms stop moving the twoVCMs.

Preferably, an adhesive glue is disposed at the bottoms of the two VCMsand the engagement surface of the adaptor to form an adhesive layer.

Preferably, the adhesive glue is applied by coating on the bottoms ofthe two VCMs and the engagement surface of the adaptor.

To achieve the aforementioned objects, the present invention provides anadjustment method for dual-lens structure with mechanic zero tilt angle,comprising the steps of: a preparation step: disposing two lenses of thedual-lens structure at a voice coil motor (VCM), with a bottom surfaceof the VCM maintaining a distance to an engagement surface of anadaptor, the two optical axes of the two lenses being parallel to eachother but unparallel to the normal of a reference plane of the adaptorso that the optical axes forming a first and second tilt angles with thenormal of the reference plane of the adaptor; an adjustment step: movingthe VCM and/or the adaptor to adjust the first and second tilt angles to0°, the optical axes of the two lenses being perpendicular to thereference plane of the adaptor and the VCM and/or the adaptor stoppingmoving; and an engagement step: adhering the bottom of the VCM to theengagement surface of the adaptor.

Preferably, a sensor is used for sensing the first and the second tiltangles; when the sensor sensing that the first and the second tiltangles becoming 0°, the VCM and/or the adaptor stops moving.

Preferably, the adaptor is disposed on a surface of a work table, with amechanical arm moving the VCM and the sensor disposed at the work table;and when the sensor sensing that the first and the second tilt anglesbecoming 0°, the mechanical arm stops moving the VCM.

Preferably, the adaptor is disposed on a surface of a work table, with amechanical arm moving the adaptor and the sensor disposed at the worktable; and when the sensor sensing that the first and the second tiltangles becoming 0°, the mechanical arm stops moving the adaptor.

Preferably, an adhesive glue is disposed at the bottom of the VCM andthe engagement surface of the adaptor to form an adhesive layer.

Preferably, the adhesive glue is applied by coating on the bottom of theVCM and the engagement surface of the adaptor.

The present invention provides the following advantages: regardless ofthe tolerance of each component and the tolerance stack up of theassembled VCM, the adjustment method for dual-lens structure withmechanic zero tilt angle of the present invention can adjust the firstand the second tilt angles to 0°, so that the optical axes of the twolenses are accurately perpendicular to the reference plane of theadaptor and the optical axes of two lenses are accurately parallel tothe normal of the reference plane of the adaptor. At this point, thereference plane of the adaptor is engaged to an image sensor, the normalof the reference plane of the adaptor overlaps the axis of the imagesensor so that the optical axes of the two lenses are parallel to theaxis of the image sensor. As such, the present invention can achieve theobject of reducing the tilt angles between the optical axes of the twolenses and the axis of the image sensor to 0°, which improves theimaging quality of the image sensor. The adjustment method is simple,efficient and low cost.

To achieve the aforementioned objects, the present invention provides adual-lens structure with mechanic zero tilt angle, comprising: twolenses, two voice coil motors (VCM) and an adaptor; wherein each of thetwo lenses having an optical axis, each of the two VCMs having a bottom,and the two lenses being disposed at the two VCMs respectively; theadaptor having an engagement surface and a reference plane, with thebottoms of the two VCMs engaged respectively to the engagement surfaceof the adaptor, and the optical axes of the two lenses beingperpendicular to the reference plane of the adaptor respectively.

Preferably, the dual-lens structure further comprises an adhesive layer,disposed between the bottoms of the two VCMs and the engagement surfaceof the adaptor.

To achieve the aforementioned objects, the present invention provides adual-lens structure with mechanic zero tilt angle, comprising: twolenses, a voice coil motor (VCM) and an adaptor; wherein each of the twolenses having an optical axis, the VCM having a bottom, and the twolenses being disposed at the VCM; the adaptor having an engagementsurface and a reference plane, with the bottom of the VCM engaged to theengagement surface of the adaptor, and the optical axes of the twolenses being perpendicular to the reference plane of the adaptorrespectively.

Preferably, the dual-lens structure further comprises an adhesive layer,disposed between the bottom of the VCM and the engagement surface of theadaptor.

The present invention provides the following advantages: regardless ofthe tolerance of each component and the tolerance stack up of theassembled VCM, the dual-lens structure with mechanic zero tilt angle ofthe present invention can achieve the object that the optical axes ofthe two lenses are accurately perpendicular to the reference plane ofthe adaptor and the optical axes of two lenses are accurately parallelto the normal of the reference plane of the adaptor. At this point, thereference plane of the adaptor is engaged to an image sensor, the normalof the reference plane of the adaptor overlaps the axis of the imagesensor so that the optical axes of the two lenses are parallel to theaxis of the image sensor. As such, the present invention can achieve theobject of reducing the tilt angles between the optical axes of the twolenses and the axis of the image sensor to 0°, which improves theimaging quality of the image sensor. The structure is simple and lowcost.

The foregoing will become better understood from a careful reading of adetailed description provided herein below with appropriate reference tothe accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The embodiments can be understood in more detail by reading thesubsequent detailed description in conjunction with the examples andreferences made to the accompanying drawings, wherein:

FIG. 1 shows a schematic view of a voice coil motor of a known dual-lensstructure;

FIG. 2 shows a dissected view of a voice coil motor of a known dual-lensstructure;

FIG. 3 shows a schematic view of the flowchart of the first embodimentof the adjustment method for dual-lens structure with mechanic zero tiltangle of the present invention;

FIG. 4A shows a schematic view of the preparation step of the firstembodiment of the adjustment method for dual-lens structure withmechanic zero tilt angle of the present invention;

FIG. 4B shows a schematic view of the first adjustment sub-step of theadjustment step of the first embodiment of the adjustment method fordual-lens structure with mechanic zero tilt angle of the presentinvention;

FIG. 4C shows a schematic view of the second adjustment sub-step of theadjustment step of the first embodiment of the adjustment method fordual-lens structure with mechanic zero tilt angle of the presentinvention;

FIG. 4D shows a schematic view of the engagement step of the firstembodiment of the adjustment method for dual-lens structure withmechanic zero tilt angle of the present invention;

FIG. 5 shows a schematic view of the first embodiment of the dual-lensstructure with mechanic zero tilt angle of the present invention;

FIG. 6 shows a dissected view of the first embodiment of the dual-lensstructure with mechanic zero tilt angle of the present invention;

FIG. 7 shows a schematic view of an image sensor engaged to the firstembodiment of the dual-lens structure with mechanic zero tilt angle ofthe present invention;

FIG. 8 shows a schematic view of the flowchart of the second embodimentof the adjustment method for dual-lens structure with mechanic zero tiltangle of the present invention;

FIG. 9A shows a schematic view of the preparation step of the secondembodiment of the adjustment method for dual-lens structure withmechanic zero tilt angle of the present invention;

FIG. 9B shows a schematic view of the adjustment step of the secondembodiment of the adjustment method for dual-lens structure withmechanic zero tilt angle of the present invention;

FIG. 9C shows a schematic view of the engagement step of the secondembodiment of the adjustment method for dual-lens structure withmechanic zero tilt angle of the present invention;

FIG. 10 shows a schematic view of the second embodiment of the dual-lensstructure with mechanic zero tilt angle of the present invention;

FIG. 11 shows a dissected view of the second embodiment of the dual-lensstructure with mechanic zero tilt angle of the present invention; and

FIG. 12 shows a schematic view of an image sensor engaged to the secondembodiment of the dual-lens structure with mechanic zero tilt angle ofthe present invention.

DETAILED DESCRIPTION OF THE DISCLOSED EMBODIMENTS

In the following detailed description, for purpose of explanation,numerous specific details are set forth in order to provide a thoroughunderstanding of the disclosed embodiments. It will be apparent,however, that one or more embodiments may be practiced without thesespecific details. In other instances, well-known structures and devicesare schematically shown in order to simplify the drawing.

Refer to FIG. 3 and FIGS. 4A-4D. FIG. 3 shows a schematic view of theflowchart of the first embodiment of the adjustment method for dual-lensstructure with mechanic zero tilt angle of the present invention; FIG.4A shows a schematic view of the preparation step of the firstembodiment of the adjustment method for dual-lens structure withmechanic zero tilt angle of the present invention; FIG. 4B shows aschematic view of the first adjustment sub-step of the adjustment stepof the first embodiment of the adjustment method for dual-lens structurewith mechanic zero tilt angle of the present invention; FIG. 4C shows aschematic view of the second adjustment sub-step of the adjustment stepof the first embodiment of the adjustment method for dual-lens structurewith mechanic zero tilt angle of the present invention; and FIG. 4Dshows a schematic view of the engagement step of the first embodiment ofthe adjustment method for dual-lens structure with mechanic zero tiltangle of the present invention. The first embodiment of the adjustmentmethod for dual-lens structure with mechanic zero tilt angle comprisesthe steps of:

Preparation S1: disposing two lenses (not shown) of the dual-lensstructure respectively at two voice coil motors (VCM) 20, 20′, withbottom surfaces 201, 201′ of the two VCMs 20, 20′ maintaining a distanceto an engagement surface 31 of an adaptor 30, the two optical axes 11,11′ of the two lenses unparallel to each other and the normal 321 of areference plane 32 of the adaptor 30 so that the optical axes 11, 11′forming a first and second tilt angles θ1, θ2 with the normal 321 of thereference plane 32 of the adaptor 30, as shown in FIG. 3 and FIG. 4A.Specifically, each VCM 20, 20′ comprises an outer cover 21, 21′, anupper resilient stripe 22, 22′, four magnets 23, 23′, a coil 24, 24′, abase 25, 25′, a lower resilient stripe 26, 26′ and a lower cover 27,27′. The bottom of the lower cover 27, 27′ is defined as the bottom 201,201′ of the VCM 20, 20′, as shown in FIG. 5 and FIG. 6. Because the VCM20, 20′ and the components are of known technology, the connection andfunction of the components will not be described here.

Adjustment S2: moving at least one of the two VCMs 20, 20′ and theadaptor 30 to adjust the first and second tilt angles θ1, θ2 to 0°; whenthe first and second tilt angles θ1, θ2 being adjusted to 0°, theoptical axes 11, 11′ of the two lenses being perpendicular to thereference plane 32 of the adaptor 30 and the at least one of the twoVCMs 20, 20′ and the adaptor 30 stopping moving, as shown in FIG. 3,FIGS. 4B-4C. In other words, the first and second tilt angles θ1, θ2being 0° means that the optical axes 11, 11′ of the two lenses areparallel to the normal 321 of the reference plane 32 of the adaptor 30.The moving refers to the motion in the six degrees of freedom in thethree dimensional space, that is, an object moving along the X-axis,Y-axis and Z-axis, and rotating around the X-axis, Y-axis and Z-axis.Accordingly, in this step, the at least one of the two VCMs 20, 20′ andthe adaptor 30 moves along the X-axis, Y-axis and Z-axis, and rotatesaround the X-axis, Y-axis and Z-axis so as to adjust the first andsecond tilt angles θ1, θ2. In the present embodiment, the adjustment S2further comprises a first adjustment S21 and a second adjustment S22.The first adjustment S21 is: moving one of the VCMs 20′ to make theoptical axes 11, 11′ of the two lenses parallel, as shown in FIG. 3 andFIG. 4B; and the second adjustment S22 is: moving the two VCMs 20, 20′simultaneously to adjust the first and the second tilt angles θ1, θ2 to0°, as shown in FIG. 3 and FIG. 4C. Preferably, a sensor 40 is used forsensing the first and the second tilt angles θ1, θ2; when the sensor 40sensing that the first and the second tilt angles θ1, θ2 becoming 0°(i.e., the optical axes 11, 11′ of the two lenses are perpendicular tothe reference plane 32 of the adaptor 30, and the optical axes 11, 11′of the two lenses are parallel to the normal 321 of the reference plane32 of the adaptor 30), the sensor 40 will propagate the sensing resultto a control device (not shown), and the control device will control theat least one of the two VCMs 20, 20′ and the adaptor 30 to stop moving.As such, the optical axes 11, 11′ of the two lenses maintains in a stateof being perpendicular to the reference plane 32 of the adaptor 30. Inthe present embodiment, the adaptor 30 is disposed on a surface 51 of awork table 50, with two mechanical arms (not shown) moving the two VCMs20, 20′ and the sensor 40 disposed at the work table 50; and when thesensor 40 sensing that the first and the second tilt angles θ1, θ2becoming 0° (i.e., the optical axes 11, 11′ of the two lenses areperpendicular to the reference plane 32 of the adaptor 30, and theoptical axes 11, 11′ of the two lenses are parallel to the normal 321 ofthe reference plane 32 of the adaptor 30), the sensor 40 will propagatethe sensing result to a control device, and the control device willcontrol the two mechanical arms to stop moving the at least one of thetwo VCMs 20, 20′.

Engagement S3: adhering the bottoms 201, 201′ of the VCMs 20, 20′ to theengagement surface 31 of the adaptor 30, as shown in FIG. 3 and FIG. 4D.Moreover, an adhesive glue is disposed at the bottoms 201, 201′ of thetwo VCMs 20, 20′ and the engagement surface 31 of the adaptor 30 to forman adhesive layer 60. Preferably, the adhesive glue is applied bycoating on the bottoms 201, 201′ of the two VCMs 20, 20′ and theengagement surface 31 of the adaptor 30.

As such, regardless of the tolerance of each component and the tolerancestack up of the assembled VCM 20, 20′, the first embodiment of theadjustment method for dual-lens structure with mechanic zero tilt angleof the present invention can adjust the first and the second tilt anglesθ1, θ2 to 0°, so that the optical axes 11, 11′ of the two lenses areaccurately perpendicular to the reference plane 32 of the adaptor 30 andthe optical axes 11, 11′ of two lenses are accurately parallel to thenormal 321 of the reference plane 32 of the adaptor 30 to obtain thefirst embodiment of a dual-lens structure with mechanic zero tilt angle,as shown in FIG. 5 and FIG. 6. At this point, the reference plane 32 ofthe adaptor 30 is engaged to an image sensor 2, the normal 321 of thereference plane 32 of the adaptor 30 overlaps the axis 2A of the imagesensor 2 so that the optical axes 11, 11′ of the two lenses are parallelto the axis 2A of the image sensor 2. As such, the present invention canachieve the object of reducing the tilt angles between the optical axes11, 11′ of the two lenses and the axis 2A of the image sensor to 0°,which improves the imaging quality of the image sensor. The adjustmentmethod is simple, efficient and low cost.

Refer to FIGS. 5-7. FIG. 5 shows a schematic view of the firstembodiment of the dual-lens structure with mechanic zero tilt angle ofthe present invention; FIG. 6 shows a dissected view of the firstembodiment of the dual-lens structure with mechanic zero tilt angle ofthe present invention; and FIG. 7 shows a schematic view of an imagesensor engaged to the first embodiment of the dual-lens structure withmechanic zero tilt angle of the present invention. The first embodimentof the dual-lens structure with mechanic zero tilt angle of the presentinvention comprises: two lenses (not shown), two voice coil motors (VCM)20, 20′, an adaptor 30 and an adhesive layer 60.

Each of the two lenses has an optical axis 11, 11′.

Each of the two VCMs 20, 20′ has a bottom 201, 201′, and the two lensesare disposed at the two VCMs 20, 20′, respectively. Specifically, eachVCM 20, 20′ comprises an outer cover 21, 21′, an upper resilient stripe22, 22′, four magnets 23, 23′, a coil 24, 24′, a base 25, 25′, a lowerresilient stripe 26, 26′ and a lower cover 27, 27′. The bottom of thelower cover 27, 27′ is defined as the bottom 201, 201′ of the VCM 20,20′, as shown in FIG. 5 and FIG. 6. Because the VCM 20, 20′ and thecomponents are of known technology, the connection and function of thecomponents will not be described here.

The adaptor 30 has an engagement surface 31 and a reference plane 32.The adhesive layer 60 is disposed between the bottoms 201, 201′ of thetwo VCMs 20, 20′ and the engagement surface 31 of the adaptor 30 so thatthe bottoms 201, 201′ of the two VCMs 20, 20′ are fixed to theengagement surface 31 of the adaptor 30; wherein the optical axes 11,11′ of the two lenses are perpendicular to the reference plane 32 of theadaptor 30 respectively. In other words, the optical axes 11, 11′ of thetwo lenses are parallel to the normal 321 of the reference plane 32 ofthe adaptor 30. Therefore, the first and the second tilt angles θ1, 02between the optical axes 11, 11′ of the two lenses and the normal 321 ofthe reference plane 32 of the adaptor 30 are 0°.

As such, regardless of the tolerance of each component and the tolerancestack up of the assembled VCM 20, 20′, the first embodiment of thedual-lens structure with mechanic zero tilt angle of the presentinvention makes the optical axes 11, 11′ of the two lenses to becomeaccurately perpendicular to the reference plane 32 of the adaptor 30 andthe optical axes 11, 11′ of two lenses are accurately parallel to thenormal 321 of the reference plane 32 of the adaptor 30, and the firstand the second tilt angles θ1, 02 between the optical axes 11, 11′ ofthe two lenses and the normal 321 of the reference plane 32 of theadaptor 30 are 0°. When the reference plane 32 of the adaptor 30 isengaged to an image sensor 2, the normal 321 of the reference plane 32of the adaptor 30 overlaps the axis 2A of the image sensor 2 so that theoptical axes 11, 11′ of the two lenses are parallel to the axis 2A ofthe image sensor 2, as shown in FIG. 7. As such, the present inventioncan achieve the object of the tilt angles between the optical axes 11,11′ of the two lenses and the axis 2A of the image sensor being 0°,which improves the imaging quality of the image sensor. The structure issimple and low in cost.

Refer to FIG. 8 and FIGS. 9A-9C. FIG. 8 shows a schematic view of theflowchart of the second embodiment of the adjustment method fordual-lens structure with mechanic zero tilt angle of the presentinvention; FIG. 9A shows a schematic view of the preparation step of thesecond embodiment of the adjustment method for dual-lens structure withmechanic zero tilt angle of the present invention; FIG. 9B shows aschematic view of the adjustment step of the second embodiment of theadjustment method for dual-lens structure with mechanic zero tilt angleof the present invention; and FIG. 9CD shows a schematic view of theengagement step of the second embodiment of the adjustment method fordual-lens structure with mechanic zero tilt angle of the presentinvention. The second embodiment of the adjustment method for dual-lensstructure with mechanic zero tilt angle comprises the steps of:

Preparation S101: disposing two lenses (not shown) of the dual-lensstructure at a voice coil motor (VCM) 20″, with a bottom surface 201″ ofthe VCM 20″ maintaining a distance to an engagement surface 31 of anadaptor 30, the two optical axes 11, 11′ of the two lenses beingparallel to each other and unparallel to the normal 321 of a referenceplane 32 of the adaptor 30 so that the optical axes 11, 11′ forming afirst and second tilt angles θ10, θ20 with the normal 321 of thereference plane 32 of the adaptor 30, as shown in FIG. 8 and FIG. 9A.Specifically, the VCM 20″ comprises an outer cover 21″, an upperresilient stripe 22″, four magnets 23″, a coil 24″, a base 25″, a lowerresilient stripe 26″, and a lower cover 27″. The bottom of the lowercover 27″ is defined as the bottom 201″ of the VCM 20″, as shown in FIG.10 and FIG. 11. Because the VCM 20″ and the components are of knowntechnology, the connection and function of the components will not bedescribed here.

Adjustment S201: moving the VCMs 20″ and/or the adaptor 30 to adjust thefirst and second tilt angles θ10, θ20 to 0°; when the first and secondtilt angles θ10, θ20 being adjusted to 0°, the optical axes 11, 11′ ofthe two lenses being perpendicular to the reference plane 32 of theadaptor 30 and the VCM 20″ and/or the adaptor 30 stopping moving, asshown in FIG. 8, and FIG. 9B. In other words, the first and second tiltangles θ10, θ20 being 0° means that the optical axes 11, 11′ of the twolenses are parallel to the normal 321 of the reference plane 32 of theadaptor 30. The moving refers to the motion in the six degrees offreedom in the three dimensional space, that is, an object moving alongthe X-axis, Y-axis and Z-axis, and rotating around the X-axis, Y-axisand Z-axis. Accordingly, in this step, the VCM 20″ and/or the adaptor 30moves along the X-axis, Y-axis and Z-axis, and rotates around theX-axis, Y-axis and Z-axis so as to adjust the first and second tiltangles θ10, θ20. Preferably, a sensor 40 is used for sensing the firstand the second tilt angles θ10, θ20; when the sensor 40 sensing that thefirst and the second tilt angles θ10, θ20 becoming 0° (i.e., the opticalaxes 11, 11′ of the two lenses are perpendicular to the reference plane32 of the adaptor 30, and the optical axes 11, 11′ of the two lenses areparallel to the normal 321 of the reference plane 32 of the adaptor 30),the sensor 40 will propagate the sensing result to a control device (notshown), and the control device will control the VCM 20″ and/or theadaptor 30 to stop moving. As such, the optical axes 11, 11′ of the twolenses maintains in a state of being perpendicular to the referenceplane 32 of the adaptor 30. In the present embodiment, the adaptor 30 isdisposed on a surface 51 of a work table 50, with a mechanical arm (notshown) moving the VCM 20 and the sensor 40 disposed at the work table50; and when the sensor 40 sensing that the first and the second tiltangles θ10, θ20 becoming 0° (i.e., the optical axes 11, 11′ of the twolenses are perpendicular to the reference plane 32 of the adaptor 30,and the optical axes 11, 11′ of the two lenses are parallel to thenormal 321 of the reference plane 32 of the adaptor 30), the sensor 40will propagate the sensing result to a control device, and the controldevice will control the mechanical arm to stop moving the VCM 20″. Inother embodiments, the VCM 20″ is disposed on a surface 51 of a worktable 50, with a mechanical arm (not shown) moving the adaptor 30 andthe sensor 40 disposed at the work table 50; and when the sensor 40sensing that the first and the second tilt angles θ10, θ20 becoming 0°(i.e., the optical axes 11, 11′ of the two lenses are perpendicular tothe reference plane 32 of the adaptor 30, and the optical axes 11, 11′of the two lenses are parallel to the normal 321 of the reference plane32 of the adaptor 30), the sensor 40 will propagate the sensing resultto a control device, and the control device will control the mechanicalarm to stop moving the adaptor 30.

Engagement S301: adhering the bottom 201″ of the VCM 20″ to theengagement surface 31 of the adaptor 30, as shown in FIG. 8 and FIG. 9C.Moreover, an adhesive glue is disposed at the bottom 201″ of the VCM 20″and the engagement surface 31 of the adaptor 30 to form an adhesivelayer 60. Preferably, the adhesive glue is applied by coating on thebottom 201″ of the VCM 20″ and the engagement surface 31 of the adaptor30.

As such, regardless of the tolerance of each component and the tolerancestack up of the assembled VCM 20″, the first embodiment of theadjustment method for dual-lens structure with mechanic zero tilt angleof the present invention can adjust the first and the second tilt anglesθ10, θ20 to 0°, so that the optical axes 11, 11′ of the two lenses areaccurately perpendicular to the reference plane 32 of the adaptor 30 andthe optical axes 11, 11′ of two lenses are accurately parallel to thenormal 321 of the reference plane 32 of the adaptor 30 to obtain thefirst embodiment of a dual-lens structure with mechanic zero tilt angle,as shown in FIG. 10 and FIG. 11. At this point, the reference plane 32of the adaptor 30 is engaged to an image sensor 2, the normal 321 of thereference plane 32 of the adaptor 30 overlaps the axis 2A of the imagesensor 2 so that the optical axes 11, 11′ of the two lenses are parallelto the axis 2A of the image sensor 2. As such, the present invention canachieve the object of reducing the tilt angles between the optical axes11, 11′ of the two lenses and the axis 2A of the image sensor to 0°,which improves the imaging quality of the image sensor. The adjustmentmethod is simple, efficient and low cost.

Refer to FIGS. 10-12. FIG. 10 shows a schematic view of the secondembodiment of the dual-lens structure with mechanic zero tilt angle ofthe present invention; FIG. 11 shows a dissected view of the secondembodiment of the dual-lens structure with mechanic zero tilt angle ofthe present invention; and FIG. 12 shows a schematic view of an imagesensor engaged to the second embodiment of the dual-lens structure withmechanic zero tilt angle of the present invention. The second embodimentof the dual-lens structure with mechanic zero tilt angle of the presentinvention comprises: two lenses (not shown), a voice coil motors (VCM)20″, an adaptor 30 and an adhesive layer 60.

Each of the two lenses has an optical axis 11, 11′.

The VCM 20″ has a bottom 201″, and the two lenses are disposed at theVCM 20″. Specifically, the VCM 20″ comprises an outer cover 21″, anupper resilient stripe 22″, four magnets 23″, a coil 24″, a base 25″, alower resilient stripe 26″ and a lower cover 27″. The bottom of thelower cover 27″ is defined as the bottom 201″ of the VCM 20″.

The adaptor 30 has an engagement surface 31 and a reference plane 32.The adhesive layer 60 is disposed between the bottom 201″ of the VCM 20″and the engagement surface 31 of the adaptor 30 so that the bottom 201″of the VCM 20″ are fixed to the engagement surface 31 of the adaptor 30;wherein the optical axes 11, 11′ of the two lenses are perpendicular tothe reference plane 32 of the adaptor 30 respectively. In other words,the optical axes 11, 11′ of the two lenses are parallel to the normal321 of the reference plane 32 of the adaptor 30. Therefore, the firstand the second tilt angles θ10, θ20 between the optical axes 11, 11′ ofthe two lenses and the normal 321 of the reference plane 32 of theadaptor 30 are 0°.

As such, regardless of the tolerance of each component and the tolerancestack up of the assembled VCM 20″, the first embodiment of the dual-lensstructure with mechanic zero tilt angle of the present invention makesthe optical axes 11, 11′ of the two lenses to become accuratelyperpendicular to the reference plane 32 of the adaptor 30 and theoptical axes 11, 11′ of two lenses are accurately parallel to the normal321 of the reference plane 32 of the adaptor 30, and the first and thesecond tilt angles θ1, 02 between the optical axes 11, 11′ of the twolenses and the normal 321 of the reference plane 32 of the adaptor 30are 0°. When the reference plane 32 of the adaptor 30 is engaged to animage sensor 2, the normal 321 of the reference plane 32 of the adaptor30 overlaps the axis 2A of the image sensor 2 so that the optical axes11, 11′ of the two lenses are parallel to the axis 2A of the imagesensor 2, as shown in FIG. 12. As such, the present invention canachieve the object of the tilt angles between the optical axes 11, 11′of the two lenses and the axis 2A of the image sensor being 0°, whichimproves the imaging quality of the image sensor. The structure issimple and low in cost.

It will be apparent to those skilled in the art that variousmodifications and variations can be made to the disclosed embodiments.It is intended that the specification and examples be considered asexemplary only, with a true scope of the disclosure being indicated bythe following claims and their equivalents.

What is claimed is:
 1. An adjustment method for dual-lens structure withmechanic zero tilt angle, comprising the steps of: a preparation step:disposing two lenses of the dual-lens structure respectively at twovoice coil motors (VCM), with bottom surfaces of the two VCMsmaintaining a distance to an engagement surface of an adaptor, the twooptical axes of the two lenses unparallel to each other and the normalof a reference plane of the adaptor so that the optical axes forming afirst and second tilt angles with the normal of the reference plane ofthe adaptor; an adjustment step: moving at least one of the two VCMs andthe adaptor to adjust the first and second tilt angles to 0°, theoptical axes of the two lenses being perpendicular to the referenceplane of the adaptor and the at least one of the two VCMs and theadaptor stopping moving; and an engagement step: adhering the bottoms ofthe VCMs to the engagement surface of the adaptor.
 2. The adjustmentmethod for dual-lens structure with mechanic zero tilt angle as claimedin claim 1, wherein the adjustment step comprises: a first adjustment:moving one of the VCMs to make the optical axes of the two lensesparallel; and a second adjustment: moving the two VCMs simultaneously toadjust the first and the second tilt angles to 0°.
 3. The adjustmentmethod for dual-lens structure with mechanic zero tilt angle as claimedin claim 1, wherein a sensor is used for sensing the first and thesecond tilt angles; when the sensor sensing that the first and thesecond tilt angles becoming 0°, the at least one of the two VCMs and theadaptor stops moving.
 4. The adjustment method for dual-lens structurewith mechanic zero tilt angle as claimed in claim 3, wherein the adaptoris disposed on a surface of a work table, with two mechanical armsmoving the two VCMs and the sensor disposed at the work table; and whenthe sensor sensing that the first and the second tilt angles becoming0°, the two mechanical arms stop moving the two VCMs.
 5. The adjustmentmethod for dual-lens structure with mechanic zero tilt angle as claimedin claim 1, wherein an adhesive glue is disposed at the bottoms of thetwo VCMs and the engagement surface of the adaptor to form an adhesivelayer.
 6. The adjustment method for dual-lens structure with mechaniczero tilt angle as claimed in claim 5, wherein the adhesive glue isapplied by coating on the bottoms of the two VCMs and the engagementsurface of the adaptor.
 7. An adjustment method for dual-lens structurewith mechanic zero tilt angle, comprising the steps of: a preparationstep: disposing two lenses of the dual-lens structure at a voice coilmotor (VCM), with a bottom surface of the VCM maintaining a distance toan engagement surface of an adaptor, the two optical axes of the twolenses being parallel to each other but unparallel to the normal of areference plane of the adaptor so that the optical axes forming a firstand second tilt angles with the normal of the reference plane of theadaptor; an adjustment step: moving the VCM and/or the adaptor to adjustthe first and second tilt angles to 0°, the optical axes of the twolenses being perpendicular to the reference plane of the adaptor and theVCM and/or the adaptor stopping moving; and an engagement step: adheringthe bottom of the VCM to the engagement surface of the adaptor.
 8. Theadjustment method for dual-lens structure with mechanic zero tilt angleas claimed in claim 7, wherein a sensor is used for sensing the firstand the second tilt angles; when the sensor sensing that the first andthe second tilt angles becoming 0°, the VCM and/or the adaptor stopsmoving.
 9. The adjustment method for dual-lens structure with mechaniczero tilt angle as claimed in claim 8, wherein the adaptor is disposedon a surface of a work table, with a mechanical arm moving the VCM andthe sensor disposed at the work table; and when the sensor sensing thatthe first and the second tilt angles becoming 0°, the mechanical armstops moving the VCM.
 10. The adjustment method for dual-lens structurewith mechanic zero tilt angle as claimed in claim 8, wherein the adaptoris disposed on a surface of a work table, with a mechanical arm movingthe adaptor and the sensor disposed at the work table; and when thesensor sensing that the first and the second tilt angles becoming 0°,the mechanical arm stops moving the adaptor.
 11. The adjustment methodfor dual-lens structure with mechanic zero tilt angle as claimed inclaim 8, wherein an adhesive glue is disposed at the bottom of the VCMand the engagement surface of the adaptor to form an adhesive layer. 12.The adjustment method for dual-lens structure with mechanic zero tiltangle as claimed in claim 7, wherein the adhesive glue is applied bycoating on the bottom of the VCM and the engagement surface of theadaptor.
 13. A dual-lens structure with mechanic zero tilt angle,comprising: two lenses, with each of the two lenses having an opticalaxis; two voice coil motors (VCM), each of the two VCMs having a bottom,and the two lenses being disposed at the two VCMs respectively; and anadaptor, having an engagement surface and a reference plane, with thebottoms of the two VCMs engaged respectively to the engagement surfaceof the adaptor, and the optical axes of the two lenses beingperpendicular to the reference plane of the adaptor respectively. 14.The dual-lens structure with mechanic zero tilt angle as claimed inclaim 13, wherein the dual-lens structure further comprises an adhesivelayer, disposed between the bottoms of the two VCMs and the engagementsurface of the adaptor.
 15. A dual-lens structure with mechanic zerotilt angle, comprising: two lenses, with each of the two lenses havingan optical axis; a voice coil motor (VCM), having a bottom, and the twolenses being disposed at the VCM; and an adaptor, having an engagementsurface and a reference plane, with the bottom of the VCM engaged to theengagement surface of the adaptor, and the optical axes of the twolenses being perpendicular to the reference plane of the adaptorrespectively.
 16. The dual-lens structure with mechanic zero tilt angleas claimed in claim 15, wherein the dual-lens structure furthercomprises an adhesive layer, disposed between the bottom of the VCM andthe engagement surface of the adaptor.